Process for preparing haloketo acid derivatives [I]:
wherein R is H or C₁₋₆ alkyl, and X is a chlorine or bromine, which comprises reacting β-oxo-acid ester [II]:
wherein R¹ is C₁₋₆ alkyl, R² is C₁₋₅ alkyl or OR³ (R³ is C₁₋₆ alkyl), and X is the same as above, with nitrosating agent [IV]:
ONOR⁴ [IV]
wherein R⁴ is H, alkyl, halogen or SO₃H to give 7-halo-2-hydroxyiminoheptanoic acid ester [III]:
wherein R¹ and X are the same as above, followed by reacting the product with aldehyde or ketone; and intermediates therefor, and process for preparing said intermediates. Said haloketo acid derivatives are useful as intermediate for synthesis of cilastatin, which is useful as medicament, especially as dehydropeptidase inhibitor.
卤
酮酸衍
生物的制备工艺 [I]:
其中 R 是 H 或 C₁₋₆烷基,X 是
氯或
溴,包括使 β-氧代酸酯[II]反应:
其中 R¹ 是 C₁₋₆烷基,R² 是 C₁₋₅烷基或 OR³(R³ 是 C₁₋₆烷基),X 同上:
ONOR⁴ [IV].
其中 R⁴ 是 H、烷基、卤素或 SO₃H,得到 7-卤代-2-羟基亚
氨基
庚酸酯 [III]:
其中 R¹ 和 X 与上述相同,然后将产物与醛或酮反应;及其中间体,以及制备上述中间体的工艺。上述卤
酮酸衍
生物可用作合成
西司他丁的中间体,
西司他丁可用作药物,特别是脱氢肽酶
抑制剂。